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Transportation-related technology has advanced so much that navigational tools can now help you stay safe while driving. For instance, Waze can warn you about the crash history of the road ahead, and Apple Maps can show you current hazards or accidents. But depending on a phone app for your safety isn’t a good idea. The best way to stay safe on the road is to keep an eye on the road signs and pavement markings.

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If you’re an experienced driver, then you’re already very familiar with common signs like No Parking, No U-Turn, Speed Limit, and Pedestrian Crossing. Most of these come in either a square, rectangle, circle, or diamond. But there’s one common road sign you probably pass by all the time that isn’t shaped like any other: the No Passing Zone sign. It has a unique pennant shape, which looks like a triangle on its side. What does this road sign mean, and is it even enforceable?

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A no-passing zone is a stretch of road, usually a two-lane bidirectional highway, where you, oncoming traffic, or both are barred from passing the vehicle in front of you. This restriction is usually marked with a solid yellow line appearing on one or both lanes.

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If there’s a solid yellow line on your lane and a broken yellow line on the left lane, it means you can’t overtake but oncoming traffic can. If it’s reversed (solid yellow line on the left lane side and broken yellow line on yours), you can pass the vehicle in front of you, but oncoming traffic must stay in its lane at all times. If it’s a double solid yellow line, no passing can happen on either lane within the entire no-passing zone.

In most cases, the pavement markings are enough to indicate the no-passing zone. However, to draw more attention to the zone, officials can decide to install a No Passing Zone sign, also referred to as W14-3. It’s a yellow, pennant-shaped road sign with black writing to signify the start of the no-passing zone. You can find it on the left side, and sometimes, it’s paired with a white rectangular Do Not Pass sign on the right.

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Not all roads with solid yellow lines automatically come with the No Passing Zone sign, though. It’s optional to have it in some states like Colorado.

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Just like other road regulations in the United States or elsewhere, the idea behind no-passing zones is to keep motorists safe. They’re usually placed in locations that make passing a dangerous maneuver, such as vertical curves like hills or dips and horizontal curves such as arcs, turns, and spirals.

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Because of the way these roads are laid out, it’s hard for a driver to clearly see ahead and determine whether there would be a safe distance between them and oncoming traffic before overtaking. To prevent motorists from making a risky pass and crashing, a no-passing zone is sometimes established.

There’s also a no-passing zone marked at least 100 feet from railway crossings, intersections, underpass/tunnels, and bridges. In some states like Connecticut, you can find a no-passing zone about 200 feet before stop signs, roundabouts, designated school zones or school driveways, hospital/fire/emergency services driveways, marked pedestrian crossings, and any other roadways with sudden narrowing or significant collective traffic. These may or may not have signage.

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Generally, when you’re in a no-passing zone, you should be patient, comply with the speed limit, and stay in your lane until the end of the zone. This is especially true if farm equipment or large trucks are in front of you. Never attempt to pass them, as you likely won’t see oncoming traffic and might not have enough space in the left lane to overtake.

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There are, however, some exceptions to the no-passing rule. In many states, the no-passing rule doesn’t apply if you’re turning left — perhaps from your driveway or into an intersection. In states like Nebraska and Florida, you can overtake in a no-passing zone when there’s an obstruction in your lane. Just make sure to do so with care. In Colorado and Minnesota, you can pass in a no-passing zone if it’s a bicyclist that’s in front of you, and you see no oncoming vehicles. As you do so, set a distance of at least three feet between you and the rider. In Montana, you can overtake a bicycle in a no-passing zone too, but they should be riding at under half of the speed limit in that area, and you won’t be overspeeding.

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If you encounter these exceptions on the road, you can pass on the left as you normally would. First, check for right-of-way vehicles. Once the left lane is clear, switch on your left turn signal light and prepare to move lanes. Then, move right back to the right lane as soon as you’re already a couple of feet away from the vehicle you’ve overtaken. Do this for only one vehicle at a time. If you’re the car being passed, slow down a tad bit to let the other driver overtake easier.

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The short answer is yes — you can’t legally pass in a no-passing zone, unless a traffic officer told you to do so, or in cases with exemptions mentioned earlier. 

A no-passing zone is a traffic regulation, and like other rules of the road, blatantly disobeying this law is a fineable offense in many states. In Colorado, overtaking a vehicle in front of you while you’re in a no-passing zone is considered a class A traffic infraction with a penalty of $100. In Oregon, you’ll be cited for a Class B violation and can be fined at least $135 or at most $1000. Meanwhile, improper passing in New Jersey (which includes ignoring the no-passing zone markings and signs) means a fine of between $52 and $202. The same is true in Florida, where you’ll be charged with a moving violation and a $60 fee. 

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Perhaps one of the harshest penalties is in Montana. If you’ve been convicted of breaking the no-passing zone rules, you could either be charged a fine of between $50 and $500, thrown in prison for six months or less, or both. 

Make sure to check the specifics of your local state laws regarding no-passing zones. But even if you won’t be legally fined or pulled over for disobeying the no-passing zone in your state, it’s still important to follow the law to keep you and other drivers on the road safe. This is one of the best driving safety tips to keep in mind, especially at night when visibility is even lower. 

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The Pass With Care sign (R4-2) means from here on out, you can overtake anytime it’s safe to do so. The sign is normally paired with the Do Not Pass sign (R4-1) to indicate the entirety of the no-passing zone, with Do Not Pass at the start of the zone and Pass With Care right at the end. You should see this sign on the right side of the road, unlike the No Passing Zone sign, which is installed on the left.  

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Appearance-wise, the Pass With Care sign is a lot different from the No Passing Zone sign. It usually comes as a white rectangle with black writing, but in some states like California, it’s a yellow rectangle with black writing. 

Neither the No Passing Zone and Pass With Care signs are necessarily required by law, and are only used to supplement the pavement markings if more emphasis is needed. But in temporary cases, Pass With Care, along with Do Not Pass and No Passing Zone, can be installed to replace the pavement markings that identify the no-passing zones. For instance, if a construction project blocks the markings or completely destroys them, the road signs can inform the motorists about the no-passing zones instead. 

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